Renesas Hitachi H8S/2194 Series Hardware Manual page 674

REC/PB
VD (except in PB)
Value set in reference
period register 1 (RFD)
Counter
Value set in REF30
counter register (RFC)
Toggle mask
Counter mask
(Clear signal mask)
REF30
REF30P
Figure 28.19 Generation of the Reference Signal when PB is Switched to REC
where RFD Bit is 1 (when VD Signal is Not Detected) (2)
PB
Masking
period
Masking
period
25% 25% 25%
REC(ASM)
FDS bit = "1"
Rev. 2.0, 11/00, page 647 of 1037